Q: On expanded usercard add a line with "last seen" status I believe a useful feature on the expanded usercard would be the time a user was "last seen". The time a user was "last seen" can already be found on their profile.
Currently the expanded usercard can look like:

when a user has not provided a link to their website.
And as you can see, there is a void below the user's location. Why not fill it with something useful:

My feature request is actually slightly more general: regardless of a provided website or not, simply include the "last seen" info somewhere on the expanded usercard.

see also: https://stackoverflow.com/help/privileges/established-user 

A: Instead of "Last seen" how about after 6 months of inactivity on all sites we have "Not seen for X months" - then we might make assumptions that they have abandoned the post and that replies (or choosing an answer) may not be forthcoming.
